LT1725CS#TRPBF

Frequency - Switching:	90kHz ~ 115kHz
Base Part Number:	LT1725
Supplier Device Package:	16-SOIC
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Operating Temperature:	0°C ~ 100°C (TJ)
Control Features:	Enable, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	90%
Series:	--
Voltage - Supply (Vcc/Vdd):	9.7 V ~ 22 V
Output Phases:	1
Number of Outputs:	1
Topology:	Flyback
Output Configuration:	Positive or Negative, Isolation Capable
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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IntroductionLT1725CS#TRPBF is a precision, low-noise, adjustable output, step-down switching DC-DC controller, which is ideal for battery-powered applications in low-voltage, high-current applications such as automotive, industrial and consumer electronics. It has very low quiescent current and significant efficiency at heavy load. This article will explore the application field and working principle of LT1725CS#TRPBF.Application FieldLT1725CS#TRPBF is mainly used in automotive, industrial and consumer electronics applications. It is designed to provide adjustable step down voltage from an input voltage of up to 28V. The maximum output current is typically 2.5A for load regulation accuracies of ±1%. In automotive applications, it is mainly used for automotive sensors, such as air bag crash sensors, speed sensors, door sensors and rearview mirror adjustable functions. In industrial applications, it is suitable for industrial telecommunications, optical transmission, medical instrumentation, vibration monitoring and fault alarm systems, UPS and power measurement systems, power testing and analysis applications. In consumer electronics applications, it is suitable for various consumer products such as portable DVD players, digital TVs, digital cameras, and game consoles.Working PrincipleThe high efficiency of LT1725CS#TRPBF is mainly achieved by its synchronous buck topology under low load conditions. The switching frequency of this controller can be adjusted with a resistor, and the switching frequency can be up to 2MHz.The input supply of LT1725CS#TRPBF is used to charge the internal start-up capacitor and VCC capacitor, and then to feed the internal circuits. The internal oscillator monitors the voltage of the VCC capacitor and sends signals to the switching layer. The output signal turns on the high-side power MOSFET gate and the controller starts the switching cycle. Then the high-side MOSFET allows the output voltage to go lower in order to provide the required output current. The internal synchronous MOSFET driver will turn on the low-side power MOSFET to pull the output voltage lower. This is followed by the controller turning off the high-side MOSFET and the low-side MOSFET turning off. Finally, the controller resets the cycle and repeats this switching process. The feedback loop is used to produce the accurate output voltage, and so the output successful voltage is founded.The output voltage accuracy of LT1725CS#TRPBF is also improved by its internal voltage reference, which is capable of setting the output voltage to a precise value. The narrow output adjustment range makes the system more stable, and improves the efficiency of power supply.ConclusionLT1725CS#TRPBF is a precision, low-noise, adjustable output, step-down switching DC-DC controller. It is mainly used in automotive, industrial and consumer electronics applications. Its high efficiency is mainly achieved by its synchronous buck topology under low load conditions, and its output voltage accuracy is improved by its internal voltage reference.

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